Improving sleep quality and quantity—ideally 7–8 hours—significantly boosts longevity by aiding cellular repair, cognitive function, and metabolic health. Key tips include keeping a consistent schedule, optimizing the environment (cool/dark), limiting blue light, avoiding caffeine/alcohol, and exercising regularly. Good sleep can add years to life expectancy. 

Top Five Tips for Better Sleep

1. Maintain a Consistent Schedule: Go to bed and wake up at the same time every day, including weekends, to regulate your circadian rhythm.
2. Create a Sleep Sanctuary: Keep the bedroom cool (around 65°F–68°F or 18°C–20°C), dark, and quiet.
3. Eliminate Blue Light Exposure: Turn off electronic devices (phones, TVs, laptops) at least 30–60 minutes before bed to allow for natural melatonin production.
4. Watch Diet and Substance Intake: Avoid heavy meals, caffeine, and alcohol within 3 hours of bedtime.
5. Establish a Relaxing Routine: Create a calming ritual like reading, listening to music, or taking a warm bath to signal to your body it is time to wind down. 

Impact on Longevity
High-quality sleep is crucial for repairing tissues, boosting the immune system, and consolidating memories. Studies indicate that maintaining good sleep habits—such as falling asleep easily, staying asleep, and waking up refreshed—can add nearly five years to a man’s life expectancy and over two years to a woman’s. Conversely, chronic sleep deprivation is linked to higher risks of cardiovascular disease, obesity, and cognitive decline.